<?php
/*
 * Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.html or http://ckeditor.com/license
 *
 * Optimized for integration into phpwcms.
 */

/**
 * \brief CKEditor class that can be used to create editor
 * instances in PHP pages on server side.
 * @see http://ckeditor.com
 *
 * Sample usage:
 * @code
 * $CKEditor = new CKEditor();
 * $CKEditor->editor("editor1", "<p>Initial value.</p>");
 * @endcode
 */

if (IS_PHP5) {

	class CKEditor
	{
		/**
		 * The version of %CKEditor.
		 */
		const version = '3.6.2';
		/**
		 * A constant string unique for each release of %CKEditor.
		 */
		const timestamp = 'B8DJ5M3';

		/**
		 * URL to the %CKEditor installation directory (absolute or relative to document root).
		 * If not set, CKEditor will try to guess it's path.
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->basePath = '/ckeditor/';
		 * @endcode
		 */
		public $basePath;
		/**
		 * An array that holds the global %CKEditor configuration.
		 * For the list of available options, see http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.config.html
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->config['height'] = 400;
		 * // Use @@ at the beggining of a string to ouput it without surrounding quotes.
		 * $CKEditor->config['width'] = '@@screen.width * 0.8';
		 * @endcode
		 */
		public $config = array();
		/**
		 * A boolean variable indicating whether CKEditor has been initialized.
		 * Set it to true only if you have already included
		 * &lt;script&gt; tag loading ckeditor.js in your website.
		 */
		public $initialized = false;
		/**
		 * Boolean variable indicating whether created code should be printed out or returned by a function.
		 *
		 * Example 1: get the code creating %CKEditor instance and print it on a page with the "echo" function.
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->returnOutput = true;
		 * $code = $CKEditor->editor("editor1", "<p>Initial value.</p>");
		 * echo "<p>Editor 1:</p>";
		 * echo $code;
		 * @endcode
		 */
		public $returnOutput = false;
		/**
		 * An array with textarea attributes.
		 *
		 * When %CKEditor is created with the editor() method, a HTML &lt;textarea&gt; element is created,
		 * it will be displayed to anyone with JavaScript disabled or with incompatible browser.
		 */
		public $textareaAttributes = array( "rows" => 8, "cols" => 60 );
		/**
		 * A string indicating the creation date of %CKEditor.
		 * Do not change it unless you want to force browsers to not use previously cached version of %CKEditor.
		 */
		public $timestamp = "B8DJ5M3";
		/**
		 * An array that holds event listeners.
		 */
		private $events = array();
		/**
		 * An array that holds global event listeners.
		 */
		private $globalEvents = array();

		/**
		 * Main Constructor.
		 *
		 *  @param $basePath (string) URL to the %CKEditor installation directory (optional).
		 */
		function __construct($basePath = null) {
			if (!empty($basePath)) {
				$this->basePath = $basePath;
			}
		}

		/**
		 * Creates a %CKEditor instance.
		 * In incompatible browsers %CKEditor will downgrade to plain HTML &lt;textarea&gt; element.
		 *
		 * @param $name (string) Name of the %CKEditor instance (this will be also the "name" attribute of textarea element).
		 * @param $value (string) Initial value (optional).
		 * @param $config (array) The specific configurations to apply to this editor instance (optional).
		 * @param $events (array) Event listeners for this editor instance (optional).
		 *
		 * Example usage:
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->editor("field1", "<p>Initial value.</p>");
		 * @endcode
		 *
		 * Advanced example:
		 * @code
		 * $CKEditor = new CKEditor();
		 * $config = array();
		 * $config['toolbar'] = array(
		 *     array( 'Source', '-', 'Bold', 'Italic', 'Underline', 'Strike' ),
		 *     array( 'Image', 'Link', 'Unlink', 'Anchor' )
		 * );
		 * $events['instanceReady'] = 'function (ev) {
		 *     alert("Loaded: " + ev.editor.name);
		 * }';
		 * $CKEditor->editor("field1", "<p>Initial value.</p>", $config, $events);
		 * @endcode
		 */
		public function editor($name, $value = "", $config = array(), $events = array())
		{
			$attr = "";
			foreach ($this->textareaAttributes as $key => $val) {
				$attr.= " " . $key . '="' . str_replace('"', '&quot;', $val) . '"';
			}
			$out = "<textarea name=\"" . $name . "\"" . $attr . ">" . htmlspecialchars($value) . "</textarea>\n";
			if (!$this->initialized) {
				$out .= $this->init();
			}

			$_config = $this->configSettings($config, $events);

			$js = $this->returnGlobalEvents();
			if (!empty($_config))
				$js .= "CKEDITOR.replace('".$name."', ".$this->jsEncode($_config).");";
			else
				$js .= "CKEDITOR.replace('".$name."');";

			$out .= $this->script($js);

			if (!$this->returnOutput) {
				print $out;
				$out = "";
			}

			return $out;
		}

		/**
		 * Replaces a &lt;textarea&gt; with a %CKEditor instance.
		 *
		 * @param $id (string) The id or name of textarea element.
		 * @param $config (array) The specific configurations to apply to this editor instance (optional).
		 * @param $events (array) Event listeners for this editor instance (optional).
		 *
		 * Example 1: adding %CKEditor to &lt;textarea name="article"&gt;&lt;/textarea&gt; element:
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->replace("article");
		 * @endcode
		 */
		public function replace($id, $config = array(), $events = array())
		{
			$out = "";
			if (!$this->initialized) {
				$out .= $this->init();
			}

			$_config = $this->configSettings($config, $events);

			$js = $this->returnGlobalEvents();
			if (!empty($_config)) {
				$js .= "CKEDITOR.replace('".$id."', ".$this->jsEncode($_config).");";
			}
			else {
				$js .= "CKEDITOR.replace('".$id."');";
			}
			$out .= $this->script($js);

			if (!$this->returnOutput) {
				print $out;
				$out = "";
			}

			return $out;
		}

		/**
		 * Replace all &lt;textarea&gt; elements available in the document with editor instances.
		 *
		 * @param $className (string) If set, replace all textareas with class className in the page.
		 *
		 * Example 1: replace all &lt;textarea&gt; elements in the page.
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->replaceAll();
		 * @endcode
		 *
		 * Example 2: replace all &lt;textarea class="myClassName"&gt; elements in the page.
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->replaceAll( 'myClassName' );
		 * @endcode
		 */
		public function replaceAll($className = null)
		{
			$out = "";
			if (!$this->initialized) {
				$out .= $this->init();
			}

			$_config = $this->configSettings();

			$js = $this->returnGlobalEvents();
			if (empty($_config)) {
				if (empty($className)) {
					$js .= "CKEDITOR.replaceAll();";
				}
				else {
					$js .= "CKEDITOR.replaceAll('".$className."');";
				}
			}
			else {
				$classDetection = "";
				$js .= "CKEDITOR.replaceAll( function(textarea, config) {\n";
				if (!empty($className)) {
					$js .= "	var classRegex = new RegExp('(?:^| )' + '". $className ."' + '(?:$| )');\n";
					$js .= "	if (!classRegex.test(textarea.className))\n";
					$js .= "		return false;\n";
				}
				$js .= "	CKEDITOR.tools.extend(config, ". $this->jsEncode($_config) .", true);";
				$js .= "} );";

			}

			$out .= $this->script($js);

			if (!$this->returnOutput) {
				print $out;
				$out = "";
			}

			return $out;
		}

		/**
		 * Adds event listener.
		 * Events are fired by %CKEditor in various situations.
		 *
		 * @param $event (string) Event name.
		 * @param $javascriptCode (string) Javascript anonymous function or function name.
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->addEventHandler('instanceReady', 'function (ev) {
		 *     alert("Loaded: " + ev.editor.name);
		 * }');
		 * @endcode
		 */
		public function addEventHandler($event, $javascriptCode)
		{
			if (!isset($this->events[$event])) {
				$this->events[$event] = array();
			}
			// Avoid duplicates.
			if (!in_array($javascriptCode, $this->events[$event])) {
				$this->events[$event][] = $javascriptCode;
			}
		}

		/**
		 * Clear registered event handlers.
		 * Note: this function will have no effect on already created editor instances.
		 *
		 * @param $event (string) Event name, if not set all event handlers will be removed (optional).
		 */
		public function clearEventHandlers($event = null)
		{
			if (!empty($event)) {
				$this->events[$event] = array();
			}
			else {
				$this->events = array();
			}
		}

		/**
		 * Adds global event listener.
		 *
		 * @param $event (string) Event name.
		 * @param $javascriptCode (string) Javascript anonymous function or function name.
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->addGlobalEventHandler('dialogDefinition', 'function (ev) {
		 *     alert("Loading dialog: " + ev.data.name);
		 * }');
		 * @endcode
		 */
		public function addGlobalEventHandler($event, $javascriptCode)
		{
			if (!isset($this->globalEvents[$event])) {
				$this->globalEvents[$event] = array();
			}
			// Avoid duplicates.
			if (!in_array($javascriptCode, $this->globalEvents[$event])) {
				$this->globalEvents[$event][] = $javascriptCode;
			}
		}

		/**
		 * Clear registered global event handlers.
		 * Note: this function will have no effect if the event handler has been already printed/returned.
		 *
		 * @param $event (string) Event name, if not set all event handlers will be removed (optional).
		 */
		public function clearGlobalEventHandlers($event = null)
		{
			if (!empty($event)) {
				$this->globalEvents[$event] = array();
			}
			else {
				$this->globalEvents = array();
			}
		}

		/**
		 * Prints javascript code.
		 *
		 * @param string $js
		 */
		private function script($js)
		{
			$out = "<script type=\"text/javascript\">";
			$out .= "//<![CDATA[\n";
			$out .= $js;
			$out .= "\n//]]>";
			$out .= "</script>\n";

			return $out;
		}

		/**
		 * Returns the configuration array (global and instance specific settings are merged into one array).
		 *
		 * @param $config (array) The specific configurations to apply to editor instance.
		 * @param $events (array) Event listeners for editor instance.
		 */
		private function configSettings($config = array(), $events = array())
		{
			$_config = $this->config;
			$_events = $this->events;

			if (is_array($config) && !empty($config)) {
				$_config = array_merge($_config, $config);
			}

			if (is_array($events) && !empty($events)) {
				foreach ($events as $eventName => $code) {
					if (!isset($_events[$eventName])) {
						$_events[$eventName] = array();
					}
					if (!in_array($code, $_events[$eventName])) {
						$_events[$eventName][] = $code;
					}
				}
			}

			if (!empty($_events)) {
				foreach($_events as $eventName => $handlers) {
					if (empty($handlers)) {
						continue;
					}
					else if (count($handlers) == 1) {
						$_config['on'][$eventName] = '@@'.$handlers[0];
					}
					else {
						$_config['on'][$eventName] = '@@function (ev){';
						foreach ($handlers as $handler => $code) {
							$_config['on'][$eventName] .= '('.$code.')(ev);';
						}
						$_config['on'][$eventName] .= '}';
					}
				}
			}

			return $_config;
		}

		/**
		 * Return global event handlers.
		 */
		private function returnGlobalEvents()
		{
			static $returnedEvents;
			$out = "";

			if (!isset($returnedEvents)) {
				$returnedEvents = array();
			}

			if (!empty($this->globalEvents)) {
				foreach ($this->globalEvents as $eventName => $handlers) {
					foreach ($handlers as $handler => $code) {
						if (!isset($returnedEvents[$eventName])) {
							$returnedEvents[$eventName] = array();
						}
						// Return only new events
						if (!in_array($code, $returnedEvents[$eventName])) {
							$out .= ($code ? "\n" : "") . "CKEDITOR.on('". $eventName ."', $code);";
							$returnedEvents[$eventName][] = $code;
						}
					}
				}
			}

			return $out;
		}

		/**
		 * Initializes CKEditor (executed only once).
		 */
		private function init()
		{
			static $initComplete;
			$out = "";

			if (!empty($initComplete)) {
				return "";
			}

			if ($this->initialized) {
				$initComplete = true;
				return "";
			}

			$args = "";
			$ckeditorPath = $this->ckeditorPath();

			if (!empty($this->timestamp) && $this->timestamp != "%"."TIMESTAMP%") {
				$args = '?t=' . $this->timestamp;
			}

			// Skip relative paths...
			if (strpos($ckeditorPath, '..') !== 0) {
				$out .= $this->script("window.CKEDITOR_BASEPATH='". $ckeditorPath ."';");
			}

			$out .= "<script type=\"text/javascript\" src=\"" . $ckeditorPath . 'ckeditor.js' . $args . "\"></script>\n";

			$extraCode = "";
			if ($this->timestamp != self::timestamp) {
				$extraCode .= ($extraCode ? "\n" : "") . "CKEDITOR.timestamp = '". $this->timestamp ."';";
			}
			if ($extraCode) {
				$out .= $this->script($extraCode);
			}

			$initComplete = $this->initialized = true;

			return $out;
		}

		/**
		 * Return path to ckeditor.js.
		 */
		private function ckeditorPath()
		{
			if (!empty($this->basePath)) {
				return $this->basePath;
			}

			/**
			 * The absolute pathname of the currently executing script.
			 * Note: If a script is executed with the CLI, as a relative path, such as file.php or ../file.php,
			 * $_SERVER['SCRIPT_FILENAME'] will contain the relative path specified by the user.
			 */
			if (isset($_SERVER['SCRIPT_FILENAME'])) {
				$realPath = dirname($_SERVER['SCRIPT_FILENAME']);
			}
			else {
				/**
				 * realpath - Returns canonicalized absolute pathname
				 */
				$realPath = realpath( './' ) ;
			}

			/**
			 * The filename of the currently executing script, relative to the document root.
			 * For instance, $_SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar
			 * would be /test.php/foo.bar.
			 */
			$selfPath = dirname($_SERVER['PHP_SELF']);
			$file = str_replace("\\", "/", __FILE__);

			if (!$selfPath || !$realPath || !$file) {
				return "/ckeditor/";
			}

			$documentRoot = substr($realPath, 0, strlen($realPath) - strlen($selfPath));
			$fileUrl = substr($file, strlen($documentRoot));
			$ckeditorUrl = str_replace("ckeditor_php5.php", "", $fileUrl);

			return $ckeditorUrl;
		}

		/**
		 * This little function provides a basic JSON support.
		 *
		 * @param mixed $val
		 * @return string
		 */
		private function jsEncode($val)
		{
			if (is_null($val)) {
				return 'null';
			}
			if (is_bool($val)) {
				return $val ? 'true' : 'false';
			}
			if (is_int($val)) {
				return $val;
			}
			if (is_float($val)) {
				return str_replace(',', '.', $val);
			}
			if (is_array($val) || is_object($val)) {
				if (is_array($val) && (array_keys($val) === range(0,count($val)-1))) {
					return '[' . implode(',', array_map(array($this, 'jsEncode'), $val)) . ']';
				}
				$temp = array();
				foreach ($val as $k => $v){
					$temp[] = $this->jsEncode("{$k}") . ':' . $this->jsEncode($v);
				}
				return '{' . implode(',', $temp) . '}';
			}
			// String otherwise
			if (strpos($val, '@@') === 0)
				return substr($val, 2);
			if (strtoupper(substr($val, 0, 9)) == 'CKEDITOR.')
				return $val;

			return '"' . str_replace(array("\\", "/", "\n", "\t", "\r", "\x08", "\x0c", '"'), array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"'), $val) . '"';
		}
	}
	
} else {
	
	class CKEditor
	{
		/**
		 * The version of %CKEditor.
		 * \private
		 */
		var $version = '3.6.2';
		/**
		 * A constant string unique for each release of %CKEditor.
		 * \private
		 */
		var $_timestamp = 'B8DJ5M3';

		/**
		 * URL to the %CKEditor installation directory (absolute or relative to document root).
		 * If not set, CKEditor will try to guess it's path.
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->basePath = '/ckeditor/';
		 * @endcode
		 */
		var $basePath;
		/**
		 * An array that holds the global %CKEditor configuration.
		 * For the list of available options, see http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.config.html
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->config['height'] = 400;
		 * // Use @@ at the beggining of a string to ouput it without surrounding quotes.
		 * $CKEditor->config['width'] = '@@screen.width * 0.8';
		 * @endcode
		 */
		var $config = array();
		/**
		 * A boolean variable indicating whether CKEditor has been initialized.
		 * Set it to true only if you have already included
		 * &lt;script&gt; tag loading ckeditor.js in your website.
		 */
		var $initialized = false;
		/**
		 * Boolean variable indicating whether created code should be printed out or returned by a function.
		 *
		 * Example 1: get the code creating %CKEditor instance and print it on a page with the "echo" function.
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->returnOutput = true;
		 * $code = $CKEditor->editor("editor1", "<p>Initial value.</p>");
		 * echo "<p>Editor 1:</p>";
		 * echo $code;
		 * @endcode
		 */
		var $returnOutput = false;
		/**
		 * An array with textarea attributes.
		 *
		 * When %CKEditor is created with the editor() method, a HTML &lt;textarea&gt; element is created,
		 * it will be displayed to anyone with JavaScript disabled or with incompatible browser.
		 */
		var $textareaAttributes = array( "rows" => 8, "cols" => 60 );
		/**
		 * A string indicating the creation date of %CKEditor.
		 * Do not change it unless you want to force browsers to not use previously cached version of %CKEditor.
		 */
		var $timestamp = "B8DJ5M3";
		/**
		 * An array that holds event listeners.
		 * \private
		 */
		var $_events = array();
		/**
		 * An array that holds global event listeners.
		 * \private
		 */
		var $_globalEvents = array();

		/**
		 * Main Constructor.
		 *
		 *  @param $basePath (string) URL to the %CKEditor installation directory (optional).
		 */
		function CKEditor($basePath = null) {
			if (!empty($basePath)) {
				$this->basePath = $basePath;
			}
		}

		/**
		 * Creates a %CKEditor instance.
		 * In incompatible browsers %CKEditor will downgrade to plain HTML &lt;textarea&gt; element.
		 *
		 * @param $name (string) Name of the %CKEditor instance (this will be also the "name" attribute of textarea element).
		 * @param $value (string) Initial value (optional).
		 * @param $config (array) The specific configurations to apply to this editor instance (optional).
		 * @param $events (array) Event listeners for this editor instance (optional).
		 *
		 * Example usage:
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->editor("field1", "<p>Initial value.</p>");
		 * @endcode
		 *
		 * Advanced example:
		 * @code
		 * $CKEditor = new CKEditor();
		 * $config = array();
		 * $config['toolbar'] = array(
		 *     array( 'Source', '-', 'Bold', 'Italic', 'Underline', 'Strike' ),
		 *     array( 'Image', 'Link', 'Unlink', 'Anchor' )
		 * );
		 * $events['instanceReady'] = 'function (ev) {
		 *     alert("Loaded: " + ev.editor.name);
		 * }';
		 * $CKEditor->editor("field1", "<p>Initial value.</p>", $config, $events);
		 * @endcode
		 */
		function editor($name, $value = "", $config = array(), $events = array())
		{
			$attr = "";
			foreach ($this->textareaAttributes as $key => $val) {
				$attr.= " " . $key . '="' . str_replace('"', '&quot;', $val) . '"';
			}
			$out = "<textarea name=\"" . $name . "\"" . $attr . ">" . htmlspecialchars($value) . "</textarea>\n";
			if (!$this->initialized) {
				$out .= $this->init();
			}

			$_config = $this->configSettings($config, $events);

			$js = $this->returnGlobalEvents();
			if (!empty($_config))
				$js .= "CKEDITOR.replace('".$name."', ".$this->jsEncode($_config).");";
			else
				$js .= "CKEDITOR.replace('".$name."');";

			$out .= $this->script($js);

			if (!$this->returnOutput) {
				print $out;
				$out = "";
			}

			return $out;
		}

		/**
		 * Replaces a &lt;textarea&gt; with a %CKEditor instance.
		 *
		 * @param $id (string) The id or name of textarea element.
		 * @param $config (array) The specific configurations to apply to this editor instance (optional).
		 * @param $events (array) Event listeners for this editor instance (optional).
		 *
		 * Example 1: adding %CKEditor to &lt;textarea name="article"&gt;&lt;/textarea&gt; element:
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->replace("article");
		 * @endcode
		 */
		function replace($id, $config = array(), $events = array())
		{
			$out = "";
			if (!$this->initialized) {
				$out .= $this->init();
			}

			$_config = $this->configSettings($config, $events);

			$js = $this->returnGlobalEvents();
			if (!empty($_config)) {
				$js .= "CKEDITOR.replace('".$id."', ".$this->jsEncode($_config).");";
			}
			else {
				$js .= "CKEDITOR.replace('".$id."');";
			}
			$out .= $this->script($js);

			if (!$this->returnOutput) {
				print $out;
				$out = "";
			}

			return $out;
		}

		/**
		 * Replace all &lt;textarea&gt; elements available in the document with editor instances.
		 *
		 * @param $className (string) If set, replace all textareas with class className in the page.
		 *
		 * Example 1: replace all &lt;textarea&gt; elements in the page.
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->replaceAll();
		 * @endcode
		 *
		 * Example 2: replace all &lt;textarea class="myClassName"&gt; elements in the page.
		 * @code
		 * $CKEditor = new CKEditor();
		 * $CKEditor->replaceAll( 'myClassName' );
		 * @endcode
		 */
		function replaceAll($className = null)
		{
			$out = "";
			if (!$this->initialized) {
				$out .= $this->init();
			}

			$_config = $this->configSettings();

			$js = $this->returnGlobalEvents();
			if (empty($_config)) {
				if (empty($className)) {
					$js .= "CKEDITOR.replaceAll();";
				}
				else {
					$js .= "CKEDITOR.replaceAll('".$className."');";
				}
			}
			else {
				$classDetection = "";
				$js .= "CKEDITOR.replaceAll( function(textarea, config) {\n";
				if (!empty($className)) {
					$js .= "	var classRegex = new RegExp('(?:^| )' + '". $className ."' + '(?:$| )');\n";
					$js .= "	if (!classRegex.test(textarea.className))\n";
					$js .= "		return false;\n";
				}
				$js .= "	CKEDITOR.tools.extend(config, ". $this->jsEncode($_config) .", true);";
				$js .= "} );";

			}

			$out .= $this->script($js);

			if (!$this->returnOutput) {
				print $out;
				$out = "";
			}

			return $out;
		}

		/**
		 * Adds event listener.
		 * Events are fired by %CKEditor in various situations.
		 *
		 * @param $event (string) Event name.
		 * @param $javascriptCode (string) Javascript anonymous function or function name.
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->addEventHandler('instanceReady', 'function (ev) {
		 *     alert("Loaded: " + ev.editor.name);
		 * }');
		 * @endcode
		 */
		function addEventHandler($event, $javascriptCode)
		{
			if (!isset($this->_events[$event])) {
				$this->_events[$event] = array();
			}
			// Avoid duplicates.
			if (!in_array($javascriptCode, $this->_events[$event])) {
				$this->_events[$event][] = $javascriptCode;
			}
		}

		/**
		 * Clear registered event handlers.
		 * Note: this function will have no effect on already created editor instances.
		 *
		 * @param $event (string) Event name, if not set all event handlers will be removed (optional).
		 */
		function clearEventHandlers($event = null)
		{
			if (!empty($event)) {
				$this->_events[$event] = array();
			}
			else {
				$this->_events = array();
			}
		}

		/**
		 * Adds global event listener.
		 *
		 * @param $event (string) Event name.
		 * @param $javascriptCode (string) Javascript anonymous function or function name.
		 *
		 * Example usage:
		 * @code
		 * $CKEditor->addGlobalEventHandler('dialogDefinition', 'function (ev) {
		 *     alert("Loading dialog: " + ev.data.name);
		 * }');
		 * @endcode
		 */
		function addGlobalEventHandler($event, $javascriptCode)
		{
			if (!isset($this->_globalEvents[$event])) {
				$this->_globalEvents[$event] = array();
			}
			// Avoid duplicates.
			if (!in_array($javascriptCode, $this->_globalEvents[$event])) {
				$this->_globalEvents[$event][] = $javascriptCode;
			}
		}

		/**
		 * Clear registered global event handlers.
		 * Note: this function will have no effect if the event handler has been already printed/returned.
		 *
		 * @param $event (string) Event name, if not set all event handlers will be removed (optional).
		 */
		function clearGlobalEventHandlers($event = null)
		{
			if (!empty($event)) {
				$this->_globalEvents[$event] = array();
			}
			else {
				$this->_globalEvents = array();
			}
		}

		/**
		 * Prints javascript code.
		 * \private
		 *
		 * @param string $js
		 */
		function script($js)
		{
			$out = "<script type=\"text/javascript\">";
			$out .= "//<![CDATA[\n";
			$out .= $js;
			$out .= "\n//]]>";
			$out .= "</script>\n";

			return $out;
		}

		/**
		 * Returns the configuration array (global and instance specific settings are merged into one array).
		 * \private
		 *
		 * @param $config (array) The specific configurations to apply to editor instance.
		 * @param $events (array) Event listeners for editor instance.
		 */
		function configSettings($config = array(), $events = array())
		{
			$_config = $this->config;
			$_events = $this->_events;

			if (is_array($config) && !empty($config)) {
				$_config = array_merge($_config, $config);
			}

			if (is_array($events) && !empty($events)) {
				foreach ($events as $eventName => $code) {
					if (!isset($_events[$eventName])) {
						$_events[$eventName] = array();
					}
					if (!in_array($code, $_events[$eventName])) {
						$_events[$eventName][] = $code;
					}
				}
			}

			if (!empty($_events)) {
				foreach($_events as $eventName => $handlers) {
					if (empty($handlers)) {
						continue;
					}
					else if (count($handlers) == 1) {
						$_config['on'][$eventName] = '@@'.$handlers[0];
					}
					else {
						$_config['on'][$eventName] = '@@function (ev){';
						foreach ($handlers as $handler => $code) {
							$_config['on'][$eventName] .= '('.$code.')(ev);';
						}
						$_config['on'][$eventName] .= '}';
					}
				}
			}

			return $_config;
		}

		/**
		 * Return global event handlers.
		 * \private
		 */
		function returnGlobalEvents()
		{
			static $returnedEvents;
			$out = "";

			if (!isset($returnedEvents)) {
				$returnedEvents = array();
			}

			if (!empty($this->_globalEvents)) {
				foreach ($this->_globalEvents as $eventName => $handlers) {
					foreach ($handlers as $handler => $code) {
						if (!isset($returnedEvents[$eventName])) {
							$returnedEvents[$eventName] = array();
						}
						// Return only new events
						if (!in_array($code, $returnedEvents[$eventName])) {
							$out .= ($code ? "\n" : "") . "CKEDITOR.on('". $eventName ."', $code);";
							$returnedEvents[$eventName][] = $code;
						}
					}
				}
			}

			return $out;
		}

		/**
		 * Initializes CKEditor (executed only once).
		 * \private
		 */
		function init()
		{
			static $initComplete;
			$out = "";

			if (!empty($initComplete)) {
				return "";
			}

			if ($this->initialized) {
				$initComplete = true;
				return "";
			}

			$args = "";
			$ckeditorPath = $this->ckeditorPath();

			if (!empty($this->timestamp) && $this->timestamp != "%"."TIMESTAMP%") {
				$args = '?t=' . $this->timestamp;
			}

			// Skip relative paths...
			if (strpos($ckeditorPath, '..') !== 0) {
				$out .= $this->script("window.CKEDITOR_BASEPATH='". $ckeditorPath ."';");
			}

			$out .= "<script type=\"text/javascript\" src=\"" . $ckeditorPath . 'ckeditor.js' . $args . "\"></script>\n";

			$extraCode = "";
			if ($this->timestamp != $this->_timestamp) {
				$extraCode .= ($extraCode ? "\n" : "") . "CKEDITOR.timestamp = '". $this->timestamp ."';";
			}
			if ($extraCode) {
				$out .= $this->script($extraCode);
			}

			$initComplete = $this->initialized = true;

			return $out;
		}

		/**
		 * Return path to ckeditor.js.
		 * \private
		 */
		function ckeditorPath()
		{
			if (!empty($this->basePath)) {
				return $this->basePath;
			}

			/**
			 * The absolute pathname of the currently executing script.
			 * Note: If a script is executed with the CLI, as a relative path, such as file.php or ../file.php,
			 * $_SERVER['SCRIPT_FILENAME'] will contain the relative path specified by the user.
			 */
			if (isset($_SERVER['SCRIPT_FILENAME'])) {
				$realPath = dirname($_SERVER['SCRIPT_FILENAME']);
			}
			else {
				/**
				 * realpath - Returns canonicalized absolute pathname
				 */
				$realPath = realpath( './' ) ;
			}

			/**
			 * The filename of the currently executing script, relative to the document root.
			 * For instance, $_SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar
			 * would be /test.php/foo.bar.
			 */
			$selfPath = dirname($_SERVER['PHP_SELF']);
			$file = str_replace("\\", "/", __FILE__);

			if (!$selfPath || !$realPath || !$file) {
				return "/ckeditor/";
			}

			$documentRoot = substr($realPath, 0, strlen($realPath) - strlen($selfPath));
			$fileUrl = substr($file, strlen($documentRoot));
			$ckeditorUrl = str_replace("ckeditor_php4.php", "", $fileUrl);

			return $ckeditorUrl;
		}

		/**
		 * This little function provides a basic JSON support.
		 * \private
		 *
		 * @param mixed $val
		 * @return string
		 */
		function jsEncode($val)
		{
			if (is_null($val)) {
				return 'null';
			}
			if (is_bool($val)) {
				return $val ? 'true' : 'false';
			}
			if (is_int($val)) {
				return $val;
			}
			if (is_float($val)) {
				return str_replace(',', '.', $val);
			}
			if (is_array($val) || is_object($val)) {
				if (is_array($val) && (array_keys($val) === range(0,count($val)-1))) {
					return '[' . implode(',', array_map(array($this, 'jsEncode'), $val)) . ']';
				}
				$temp = array();
				foreach ($val as $k => $v){
					$temp[] = $this->jsEncode("{$k}") . ':' . $this->jsEncode($v);
				}
				return '{' . implode(',', $temp) . '}';
			}
			// String otherwise
			if (strpos($val, '@@') === 0)
				return substr($val, 2);
			if (strtoupper(substr($val, 0, 9)) == 'CKEDITOR.')
				return $val;

			return '"' . str_replace(array("\\", "/", "\n", "\t", "\r", "\x08", "\x0c", '"'), array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"'), $val) . '"';
		}
	}
	
}

